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为了进一步提高束流品质并逐步采用双束加速技术,BEPCII直线加速器准备采用带有两个次谐波聚束器的双次谐波聚束系统。目前,该次谐波聚束系统的物理设计和优化已经基本完成。由于新设计的双次谐波聚束系统很不同于BEP-CII现有的聚束系统,因此,就要求对聚束系统中存在的各种抖动(jitter)效应重新进行研究。使用多粒子模拟计算程序PARMELA对电子枪的高压抖动和定时抖动、次谐波聚束器的相位抖动以及功率抖动、聚束器中加速电场相位以及A0加速管(俘获加速节)中加速电场相位的抖动等效应进行了研究,并最终确定了聚束系统中各部件的物理公差要求。
In order to further improve the beam quality and the gradual adoption of double-beam acceleration technology, the BEPCII linear accelerator is ready to use a double-harmonic focusing system with two subharmonic beamformers. At present, the physical design and optimization of this harmonic bunching system have been basically completed. Since the newly designed double harmonic bunching system is very different from the existing bunching system of BEP-CII, various jitter effects existing in the bunching system are required to be re-studied. High-voltage jitter and timing jitter of the PARMELA electron gun, phase jitter and power jitter of the sub-harmonic beamformer, the phase of the accelerating electric field in the beamsplitter, and the phase of the accelerating electric field in the A0 accelerating tube (capture accelerating node) are calculated using the PARMELA multi-particle simulation program Jitter and other effects were studied, and ultimately determine the physical constraints of the various components of the bunching system requirements.